Does a 100-km Walking Affect Indicators of Vitamin Status?
2000
Frank, Thomas | Kühl, Marco | Makowski, Beate | Bitsch, Roland | Jahreis, Gerhard | Hübscher, Johanna
The status of thiamin (B<sub>1</sub>), riboflavin (B<sub>2</sub>), ascorbic acid (AA), and tocopherol was determined in 60 leisure athletes (age 46 ± 10 y, BMI 23.7 ± 2.0 kg ¥ m<sup>–2</sup>, VO<sub>2max</sub> 39.4 ± 6.5 ml ¥ min<sup>–1</sup> ¥ kg<sup>–1</sup>), who completed a 100-km walking race. Vitamin plasma levels and activities of erythrocyte transketolase (ETK) and glutathione reductase (EGR) were measured before start, immediately after finishing and 6 hours later. The participators finished the entire distance in 14.25 h (average speed 7 km¥h<sup>–1</sup>). Before start, all participators showed an excellent vitamin status (prevalences of low vitamin status ranged between 1.7 and 1.8%). Plasma tocopherol concentrations correlated significantly with increased age (r = 0.35, p = 0.008). Compared to the values before start, plasma concentrations of B<sub>1</sub> and B<sub>2</sub> as well as ETK and/or EGR were increased significantly after finishing. The raised levels persisted 6 hours after finishing, whereas AA remained unaltered. The univariate analysis of variance revealed that the change in vitamin status after finish and 6 hours later was in part highly dependent on age, BMI and the level of physical fitness. Despite the long distance, the extensive character of the 100-km walking with its low intensity did not deteriorate the measured indicators of vitamin status.
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